1921] 
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Whee 
Metcalf: Genitalia of Male Syrphide 213 
Tropidia quadrata; lateral view of the apex of preabdomen and genitalia 
to show especially the specialization of sternite five. 
Prare Sova: 
Calliprobola aldrichi; ventro-cephalic aspect of genitalia (*284). 
Calliprobola pulcher; ventro-cephalic aspect of genitalia (*283). 
Xylota vecors; ventro-cephalic view of genitalia (*281); d, erect caudal 
lobe of the style; a, cephalic lobe of the style. 
Xylota subfasciata; ventro-cephalic view of the genitalia (*276); a, 
chitinous box. Other captions as in Figure 104. 
Xylota chalybea, ventro-cephalic view of the genitalia (*278); a, hook 
or claw of left internal lobe. Other captions as in Figure 104. 
X ylota obscura; ventro-cephalic view of the genitalia (*282); f, chitinous 
box, homologous to that shown at a, in Figure 105. Other captions 
as in Figure 104. 
Sericomyia militaris; cephalic view of genitalia (*224). a, the small 
bonnet of the ejaculatory hood. On the right of the letter a, is shown 
the right cercus; while at either side of the bonnet is the erect internal 
lobe. Between the inferior lobes is the lingula. 
The same, from the left side. 
Xylota bicolor; lateral view of genitalia (*277). Compare Plate XVI, 
Figure 4. Captions as in Figure 104. 
Spilomyia interrupta; ventro-cephalic view of genitalia (*255); a, caudal 
lobe of style; 6, cephalic lobe of style. 
Temnostoma venusta; ventro-cephalic view of genitalia (*295). d, caudal 
lobe of style; e, cephalic lobe of style. 
Spilomyia longicornis; lateral. view of right style (*229). Captions 
as in Figure 122. 
Spilomyia quadrifasciata; lateral view of right style (*228). Captions 
as in Figure 122. 
Spilomyia fusca; genitalia (*227) from the right side. Captions as in 
Figure 122. 
The same, in ventro-cephalic view. Captions as in Figure 122. 
Temnostoma aequalis; ventro-cephalic view of genitalia (*294). k, baso- 
mesal keel of superior lobe. Other captions as in Figure 123. 
PEATE Savant: 
Criorrhina nigripes; ventro-cephalic view of genitalia (*310). a, caudal 
lobe of right style; b, cephalic lobe of style; c, mesal, thumb-like 
process from caudal lobe of style; d, median pair of keels on penis- 
sheath; e, lateral pair of keels on penis-sheath; x, characteristic 
ctenidium of superior lobes. 
Criorrhina sp. (*312); ventro-cephalic view of genitalia. Captions as in 
Figure 111. 
Criorrhina sp. (*313); ventro-cephalic view of genitalia. Captions 
as in Figure 111. 
Blera scitula; cephalic view of left style and penis (*311); f, distal cap 
or pileus of superior lobe. 
Blera notata; cephalic view of genital appendages (*824), the right 
style omitted; a, erect caudal lobe of style; 6, cephalic lobe of style; 
c, baso-cephalic thumb or process from caudal lobe of style; e, emargi- 
nation between caudal and cephalic lobes of style; k, lateral keel of 
lingula. 
Blera badia; ventro-cephalic view of genitalia (*301). Captions as in 
Figure 115. 
The same, apex of penis more enlarged. k, basal, elevated, con- 
tinuation of lingula; 0, lyre-like excavation of base of lingula; m, n, p, 
the three points of the left superior lobe. 
